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Instruction: Summarize the current immigration policies in the United States.
Output:
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The immigration policies of the United States are complex, and have undergone significant changes in recent years. Currently, the US allows immigrants to enter the US through a variety of legal channels, including family-based, employment-based, and humanitarian. The US also allows temporary non-immigrant visas for those coming for pleasure, study, business, or other non-immigrant purpose. It also implements a stringent vetting process for those seeking to enter the US through the immigration process. In addition, the US has both federal and state laws governing immigration and enforcement.